WBCQ Propagation Models

The propagation studies presented here are generated using the VOACAP software suite, a free professional HF prediction program from NTIA/ITS, originally developed for Voice of America (VOA).

For each of WBCQ’s four shortwave services, a propagation prediction chart was generated for typical operating hours. All times listed are in coordinated universal time (UTC). Sunspot numbers were estimated using the predicted sunspot numbers for cycle 24 from the IPS web site.

Signal coverage is shown in a full color graphical display over a map of North America. The median field strength in dBu is shown. Higher numbers translate to a stronger signal. Just because a particular region is not shown in the signal coverage map, it doesn’t necessarily mean that that service cannot be heard there. Shortwave signal propagation varies depending on solar conditions. A solar storm or geomagnetic disturbance can enhance or degrade shortwave signal coverage in a particular area.

These charts show predicted signal coverage for January, 2017.

WBCQ 7.490 MHz

19002000210022002300240001000200030004000500

WBCQ 9.330 MHz

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

WBCQ 5.130 MHz

220023002400010002000300040005000600

WBCQ 3.250 MHz

22002300240001000200030004000500